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Method and device for adding inhibitors to reduce dioxin formation in sintering process

A technology of sintering process and adding devices, which is applied in the field of flue gas purification treatment, which can solve the problems of increasing the concentration of nitrogen oxides in the sintering tail gas and increasing operating costs, so as to reduce the generation of dioxin, reduce the amount of use, and reduce the amount of generation Effect

Active Publication Date: 2017-10-31
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It not only increases the operating cost, but also greatly increases the risk of increasing the concentration of nitrogen oxides in the tail gas

Method used

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  • Method and device for adding inhibitors to reduce dioxin formation in sintering process
  • Method and device for adding inhibitors to reduce dioxin formation in sintering process
  • Method and device for adding inhibitors to reduce dioxin formation in sintering process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The hourly consumption of mixture in a sintering plant is 899t / h, of which the consumption of sintered pellets is 7t / h. Calculated based on the addition of 0.01% inhibitor, the amount of inhibitor added per hour is 89.9kg, calculated as a solution with a concentration of 20%, then 449.5kg of inhibitor solution needs to be added to the mixture per hour, if the inhibitor solution is directly added Mixed material is equivalent to a proportion of 0.05%. However, using the two-stage mixing method, first mix 449.5kg of inhibitor solution into 7t sintered pellets, which is equivalent to a ratio of 6.4%. Compared with directly mixing into the mixture, the direct amplification is 128 times, which greatly increases the mixing effect of the inhibitor in the sintering mixture. In addition, after adding sintered pellets, the pyrolysis speed of the inhibitor is slowed down, and the inhibitory effect on the formation of dioxin is enhanced. Therefore, under the premise of low proport...

Embodiment 2

[0059] In the present invention, the inhibitor solution can also be added to the sintering mixture through the coke distribution system using the principle of two-stage mixing. as attached figure 2 As shown, after the inhibitor solution is configured as a 20% solution through the inhibitor preparation system, the formula (1) is used to calculate that when the hourly usage of the sinter mixture is 899t / h, the inhibitor addition ratio is 0.01%, Then the additive amount of the inhibitor solution is 0.4495t / h. First, according to this ratio, the inhibitor solution is evenly distributed on the surface of the coke powder, and the first-stage mixing is performed. Then it enters the sintering material mixer together with the coke powder for secondary mixing to form a sintering mixture, which is sent to the sintering machine material bed for sintering process. In this example, according to the ratio of coke powder, the hourly consumption of coke powder is 32.4t / h. The inhibitor solu...

Embodiment 3

[0062] According to the addition mode of embodiment 2, with a sintering area of ​​450 m 2 The sintering machine is the implementation object, relative to the sintering mixture, the ratio of the urea solution is 0.005%, 0.0075, 0.01%, respectively, then relative to the coke powder, the ratio of the urea solution is enlarged by 28 times, respectively becomes 0.14%, 0.21%, 0.28%. The experiments were carried out by two-stage addition method. In addition, a comparative test was carried out in which urea solution was added directly to the mix. Experimental results show that in engineering applications, when urea is added in amounts of 0.005%, 0.0075, and 0.01% (wt% sintered mixture), when urea is directly added to the mixture, the removal rates of dioxins are 10%, 21%, respectively. % and 25%, and by the addition method of the present invention, the removal rate of dioxin can reach about 17%, 46% and 52% respectively. It shows that the two-pole addition method is obviously bette...

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Abstract

The invention provides an adding method and a device of an inhibitor used for reducing generation of dioxin in sintering process. According to the adding method, two stage mixing is adopted for adding of the inhibitor. The adding method comprises following steps: first stage mixing is carried out, wherein an inhibitor solution is delivered into a solution conveying system, conveying amount is controlled by a flow amount control device, and the inhibitor solution is uniformly mixed in a sintered pellet system or a coke blending system; another time of mixing is carried out, wherein the sintered pellets mixed with the inhibitor solution or coke powder mixed with the inhibitor solution and a sinter mixture are delivered into a sintering material mixer for another time of mixing; and at last an obtained sintering material is delivered into a sintering machine for sintering. Fine control on the inhibitor used for reducing generation of dioxin is carried out, and adding amount of the inhibitor solution is controlled to range from 0.005 to 0.01%, so that generation of dioxin is reduced, and at the same time unfavorable influences on sintered ore quality and sintering equipment caused by excessive adding of urea are avoided.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification and treatment, and relates to a method for reducing the generation of dioxins in ironworks sintering flue gas from the source, and in particular to a method and a device for adding inhibitors for reducing the generation of dioxins in the sintering process. Background technique [0002] On November 11, 2004, the "Stockholm Convention on Persistent Organic Pollutants" came into effect in my country, which aims to eliminate and control 12 persistent organic pollutants ( International Convention on Dioxins). In this regard, the Ministry of Environmental Protection of my country and the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China jointly issued the "Steel Sintering and Pelletizing Industry Air Pollutant Emission Standard (GB28662-2012)", which clearly stipulates the emission standard of dioxin pollutants . [0003] In foreign ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/245C22B1/16
Inventor 俞勇梅王跃飞李咸伟
Owner BAOSHAN IRON & STEEL CO LTD
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